I dont know what would cause that with the TX but my fathers PC had the same issues what it turned out to be was a broken wire in the power cable fromt he PSU to the wall outlet try changing that first


I have also seen that with a cheap POS case a buddy had if you touched the case it would dead short the system was not able to trace it down but I figure a pin or MB standoff was touhing the MB someplace and when I Touched the case I compleated the circut and it owuld short out